| 摘要 |
A plurality of fin groups 12 each comprising parallel plate fins 14 are arranged on two straight tube portions 11 a of a fin fixing hairpin tube 11 longitudinally of the tube portions at a spacing, by forming two tube inserting holes 14 a as spaced apart in each of the plate fins 14 and inserting the two straight tube portions 11 a through the respective holes 14 a of the plate fins 14 . The hairpin tube 11 is enlarged with use of a fluid to fixedly fit the plate fins 14 of the fin groups 12 around the straight tube portions 11 a of the tube 11 . The straight tube portions 11 a of the tube 11 each have a finless part 13 provided between each pair of adjacent fin groups 12 . The finless part 13 of each straight tube portion 11 a bears clamp marks 19 on the outer peripheral surface thereof. A heat exchanger comprising a heat exchanger finned tube 10 thus constructed is adapted to diminish leakage of the refrigerant and achieves a desired refrigeration efficiency.
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